docs(web): add soundtouch-web parity roadmap

Document the remaining feature gap between soundtouch-web and the
Stockholm app's local-control functionality (seek/scrub, queue view,
per-device settings) and the explicit non-goals (anything cloud-bound
that is either shut down or already handled by soundtouch-service).
Acts as both a contributor checklist and a public statement of what
the web UI will and won't try to cover.

Link the page under the Concepts section in SUMMARY.md so it shows up
in the published docs and satisfies the docs-consistency test.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/SUMMARY.md

@@ -54,6 +54,7 @@
 * [Request Recording](REQUEST_RECORDING_CONCEPT.md)
 * [Spotify Priming Strategy](concepts/spotify-priming-strategy.md)
 * [Spotify OAuth](concepts/spotify-oauth.md)
+* [soundtouch-web Roadmap](soundtouch-web-roadmap.md)
 
 ## Analysis & Research
 * [API Coverage Analysis](analysis/API-COVERAGE.md)

docs/soundtouch-web-roadmap.md

@@ -0,0 +1,97 @@
+# soundtouch-web: remaining features
+
+Three features complete the parity gap between soundtouch-web and the Stockholm
+app's local-control functionality. Everything else in Stockholm (OAuth flows,
+setup wizard, service account linking, onboarding, analytics) is cloud
+infrastructure that is either shut down or already handled by soundtouch-service.
+
+---
+
+## 1. Seek / scrub
+
+The progress bar already renders `NowPlaying.Time.Position` / `NowPlaying.Time.Total`
+with a live 1 s ticker. What's missing is the ability to click or drag it to seek.
+
+**Device API:** `POST /seek` with body `<seek deviceID="…" type="TIME_VALUE"><time>30</time></seek>`
+
+**Backend:**
+- Add `POST /api/device-seek/{id}/{seconds}` handler in `handler.go`
+- Guard on `NowPlaying.SeekSupported.Value` — return 400 if the stream doesn't
+  support seeking (radio, for example)
+
+**Frontend (`NowPlaying.js`):**
+- Replace the static `<div class="progress-bar">` with a `<input type="range">`
+- `onInput` updates local state for smooth scrubbing; `onChange` (pointer up)
+  fires `api.seek(deviceId, seconds)`
+- Pause the 1 s ticker while the user is dragging to avoid fighting the input
+
+**Client method to add (or verify exists):**
+```go
+func (c *Client) Seek(positionSeconds int) error {
+    // POST /seek
+}
+```
+
+---
+
+## 2. Favorites
+
+Mark or unmark the currently playing track as a favourite directly from the
+Now Playing card.
+
+**Device API:**
+- `GET /favorites` — returns `<favorites>` list
+- `POST /favorites` — adds current content item as a favourite
+- `DELETE /favorites/{id}` — removes a favourite by ID
+
+**Backend:**
+- `GET /api/device-favorites/{id}` — fetch favourites list
+- `POST /api/device-favorites/{id}` — add current now-playing item as favourite
+- `DELETE /api/device-favorites/{id}/{favId}` — remove a favourite
+
+**Frontend:**
+- Heart button (♡ / ♥) in `NowPlaying.js`, next to the source label
+- On mount (or when `nowPlaying` changes) fetch favourites and check whether
+  the current `ContentItem.Location` is already in the list
+- Toggle on click; optimistic UI update before the round-trip
+
+**Note:** Not all sources support favourites. Check
+`NowPlaying.FavoriteEnabled` — if the field is nil/absent, hide the button.
+
+---
+
+## 3. Device settings panel
+
+A lightweight settings page per device covering the two most useful knobs:
+rename and network/firmware info.
+
+**Device API:**
+- `GET /info` — device info (already fetched; stored as `DeviceInfo`)
+- `POST /name` with body `<name>New Name</name>` — rename the device
+- `GET /networkInfo` — IP, MAC, SSID, signal strength
+- `GET /swUpdateStatus` — current firmware version and whether an update is
+  available (not all devices expose this)
+
+**Backend:**
+- `POST /api/device-rename/{id}` — body `{"name":"…"}`; calls `POST /name`
+- `GET /api/device-network/{id}` — proxies `GET /networkInfo`
+- Optionally `GET /api/device-update-status/{id}` — proxies `GET /swUpdateStatus`
+
+**Frontend:**
+- Small ⚙ icon button in `DeviceDetail`'s page header (next to the power button)
+- Navigates to a new `page === 'settings'` state in `App`; passes `deviceId`
+- `DeviceSettings.js` component: editable name field (save on blur/Enter),
+  read-only network info card, optional firmware version badge
+- Back button returns to `'device'` page
+
+---
+
+## Decide later
+
+| Feature                                | Reason                                                             |
+|----------------------------------------|--------------------------------------------------------------------|
+| Spotify / Pandora / Amazon browsing UI | Requires Bose cloud (shutting down); handled by soundtouch-service |
+| Setup wizard (WiFi, Marge migration)   | Already in soundtouch-service setup flows                          |
+| OAuth / login flows                    | Cloud-dependent; not needed for local network access               |
+| AirPlay / Bluetooth pairing UI         | Device handles this independently; no SoundTouch Web API           |
+| Onboarding, help, analytics            | Not relevant for a local control tool                              |